HYDROGENATION OF TETRALIN ON A SULFIDED RUTHENIUM ON KY ZEOLITE CATALYST - EFFECT OF THE SULFIDATION METHOD

Hydrogenation of tetralin was used to modelize the hydrogenation of ar omatic compounds in gasoils. This reaction was carried out under a 5 M Pa hydrogen pressure, at 300 degrees C, in the presence of hydrogen su lfide. Before reaction, the Ru on KY zeolite catalyst was presulfided in situ at 400 degrees C either by a H2S/H-2 mixture, or by dimethyl d isulfide in n-heptane. The catalyst sulfided by dimethyl disulfide was 3 times less active than that sulfided by H2S, due to coking during s ulfidation. Another type of carbonaceous deposit was formed during the tetralin reaction, the nature and the amount of this deposit was not depending on the sulfidation method.